Year: 2014
Type: article
Abstract: The cucumber downy mildew experiments were carried out in greenhouse of Dept. of Vegetable Crop Res., Agric. Res. Centre, under artificial inoculation and at two production plastic greenhouse (Gezerit El-Dahab Island and El-Dokki), Giza governorate during the growing spring season 2013 under natural infection, to evaluate the effect of tested plant extracts and resistance inducing chemicals (RICs) either individually or in mixtures, against the downy mildew incidence and severity. The efficiency of some plant extracts as a single treatment or combined with RICs chemicals on management of cucumber downy mildew, caused by Pseudoperonospora cubensis, was evaluated in greenhouse experiments under artificial inoculation and production greenhouse conditions under natural infection. Greenhouse experiments revealed that application of the tested plant extract, i.e. thyme (T) and garlic cloves (G) as well as four resistance inducing chemicals (RICs), i.e., calcium nitrate Ca (NO3)2-4H2O, potassium dibasic phosphate (K2HPO4), potassium monobasic phosphate (KH2PO4) and potassium nitrate (KNO3), significantly reduced the disease severity, meanwhile plant length and foliage fresh weight were increased compared with check treatments. However, plant extract combined with resistance inducing chemicals (RICs) application were more efficient in this concern than the tested RICs and/or plant extract as a single. Under production plastic greenhouse conditions, application of either (G+KNO3), (G+KH2PO4) (T+KNO3) followed by spraying of (G+K2HPO4) or {G+ Ca (NO3)2-4H2O} caused significant decrement in the disease severity with significant increment in the fruit yield when compared with check treatments.It has suggested that the combined treatment of garlic extract with potassium nitrate (KNO3) and potassium phosphate as (KH2PO4 or K2HPO4 at 75 mM) could be used commercially for controlling cucumber downy mildew disease under production greenhouse conditions.
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W7117478500